Evidence of human activity during the Mesolithic period in Irish history has been found in excavations at the Mount Sandel Mesolithic site in the north of the island, cremations on the banks of the River Shannon in the west, campsites at Lough Boora in the midlands, and middens and other sites elsewhere in the country. Early Mesolithic The earliest known human burial in Ireland is dated to 7530-7320 BCE. It was on a bend of the River Shannon at Hermitage, County Limerick which shows the early inhabitants had begun to move inland along the rivers and were not confined to the sea shores at this early date. An adze in the burial is the earliest securely dated polished adze or axe found in Europe. Later Mesolithic Chronology & Technology Prehistoric Ireland’s Later Mesolithic period begins sometime between 7000 BC and 6000 BC with the occurrence of a pan-Ireland and Isle of Man macrolithic (large stone flake/blade) stone tool tradition: no transitional industry has yet been identified that bridges the gap between this industry and the Early Mesolithic microlithic (very small flake/blade) industry that preceded it. The Later Mesolithic period ends around 4000 BC and is followed by a Neolithic lithic (stone tool) tradition based on hard and soft hammer percussion, indirect percussion, pressure flaking, and bifacing. As with the Early and Later Mesolithic, no artefacts have yet been found that represent a transition between the Later Mesolithic and Neolithic. Until recently there have been few signs of variation across the approximately 2,000–3,000 years that comprise the Later Mesolithic period – no identifiable trends toward regionalization or intensification, no noteworthy differences in settlement patterns across space or time. However, as with all static models of human society, this one has reflected data with analytical and interpretative limitations rather than certainty. The island's extensive bog and alluvial deposits have concealed informative settlement evidence and its acidic soils have decomposed and destroyed significant amounts of organic archaeological material. Furthermore, rising sea levels, which peaked between 4500 and 2000 BC, have eroded and submerged most of the coastal and estuarine evidence for foraging (hunting and gathering). These conditions, along with a historical bias towards research in northeastern Ireland, make it clear that the record is incomplete. However, the gaps are not evenly distributed across the entire period. Anderson and Johnson have pointed out that the best lithic data for the Later Mesolithic are associated